AMP-Fluorescein conjugate calibrator is desigend to use with our green fluorescent FAM-cAMP PDE IV substrate, a cAMP derivative that is a specific substrate for phosphodiesterase (PDE) IV (#Cat: 13602). This AMP-Fluorescein conjugate calibrator is the hydrolyzed product of FAM-cAMP PDE IV substrate (#Cat: 13602) by PDE IV. It is used to calibrate the hydrolysis rate of FAM-cAMP PDE IV substrate (#Cat: 13602) by PDE IV.